连接mysql数据库，创建用户模型

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import confit

app = Flask(__name__)
app.config.from_object(confit)
db = SQLAlchemy(app)

class User(db.Model):
    __tablename__ = 'user'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    nickname = db.Column(db.String(20))


# 增加
# user = User(username = 'mis1114',password = 'mis1114')
# db.session.add(user)
# db.session.commit()

#查找
user = User.query.filter(User.username == 'mis1114').first()
#删除
db.session.delete(user)
db.session.commit()
# #修改
# user.password = '234567'
# print(user.username,user.password)


# '''
# db.create_all()
# user = User.query.filter(User.username=='mis1114'.first()
# user.password = '111111'
# db.session.commit()
# '''
db.create_all()


@app.route('/')
def hello_world():
    return 'Hello World!'


if __name__ == '__main__':
    app.run()

　配置文件

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost:3306/mis_db?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

　　安装与配置python3.6+flask+mysql数据库

1. 下载安装MySQL数据库
2. 下载安装MySQL-python 中间件
3. pip install flask-sqlalchemy （Python的ORM框架SQLAlchemy）